Molecules,
Journal Year:
2024,
Volume and Issue:
29(3), P. 634 - 634
Published: Jan. 29, 2024
The
Photophysical
properties,
such
as
fluorescence
quenching,
and
photoexcitation
dynamics
of
bimolecular
non-covalent
systems
consisting
cationic
poly[(9,9-di(3,3′-N,N′-trimethyl-ammonium)
propyl
fluorenyl-2,7-diyl)-alt-co-(9,9-dioctyl-fluorenyl-2,7-diyl)]
diiodide
salt
(PFN)
anionic
graphene
carboxylate
(GC)
have
been
discovered
for
the
first
time
via
steady-state
time-resolved
femtosecond
transient
absorption
(TA)
spectroscopy
with
broadband
capabilities.
PFN
is
quenched
high
efficiency
by
GC
acceptor.
Fluorescence
lifetime
measurements
reveal
that
quenching
mechanism
static.
Here,
mechanisms
are
well
proven
TA
spectra
PFN/GC
systems.
For
systems,
photo
electron
transfer
(PET)
charge
recombination
(CR)
processes
ultrafast
(within
a
few
tens
ps)
compared
to
static
interactions,
whereas
PFN/1,4-dicyanobenzene
DCB
PET
takes
place
in
hundreds
ps
(217.50
ps),
suggesting
diffusion-controlled
process.
In
latter
case,
PFN+•–DCB−•
radical
ion
pairs
result
from
clearly
resolved,
they
long-lived.
slow
CR
process
(in
30
ns
scales)
suggests
PFN+•
DCB−•
may
already
form
separated
through
separation
(CS)
process,
which
recombine
back
initial
state
characteristic
constant
ns.
advantage
present
positively
charged
polyfluorene
used
this
work
control
over
electrostatic
interactions
transfers
polyfluorene/quencher
DMSO
solution.
In
this
work,
we
synthesized
Py-DPABT
CMP
through
Sonogashira–Hagihara
cross-coupling
reactions
between
N4,N7-bis(4-bromophenyl)-N4,N7-diphenylbenzo[c][1,2,5]thiadiazole-4,7-diamine
(DPABT-Br2)
and
1,3,6,8-tetraethynylpyrene
(Py-T).
This
was
subsequently
carbonized
at
500
700
°C
transformed
into
a
porous
carbonaceous
electrode
precursor
for
supercapacitors
(SCs),
yielding
CMP-500
CMP-700
containing
N
S
heteroatoms.
Using
distinct
analytical
methods,
investigated
the
electrochemical
characteristics,
CO2
uptake,
configuration,
porosity,
thermal
stability,
chemical
structure
of
before
after
carbonization
°C,
respectively.
After
carbonization,
material
(Py-DPABT
CMP-500)
achieved
BET
surface
area
(SABET)
423
m2
g–1
adsorption
capacity
reached
3.55
mmol
0
°C.
Electrochemical
evaluations
revealed
that
exhibited
enhanced
performance
when
utilized
as
supercapacitor
electrodes,
facilitated
by
According
to
three-electrode
analyses,
specific
capacitances
up
973
F
1
A
g–1.
Additionally,
they
demonstrated
exceptional
durability,
maintaining
98%
their
2000
cycles
tested
current
10
Furthermore,
capacitance
symmetric
coin
cell
627
The
hydrogen
evolution
reaction
were
assessed
in
M
KOH
electrolyte
utilizing
setup.
catalyst
density
mA
cm–2
with
an
overpotential
325
mV
Tafel
slope
169
dec–1.
it
low
charge
transfer
resistance
(Rct)
88
Ω
substantial
double-layer
(Cdl)
72.8
mF
cm–2,
highlighting
its
potential
efficient
electrocatalyst
HER
applications.
These
findings
underscore
practical
applications
investigate
synergistic
effects
heteroatoms
process
CMPs,
enhancing
suitability
supercapacitor,
HER.
The
structural
modification
of
metal-organic
frameworks
(MOFs)
is
vital
importance
in
many
fields,
especially
sensing
with
enhanced
performance,
while
the
efficient
synthesis
functionalized
MOF
nanoparticles
toward
small
molecule
detection
remains
challenging.
Here,
a
general
cellulose
nanofibril
(CNF)-induced
situ
one-step
strategy
was
proposed
for
dual-ligand-functionalized
europium-based
(EuMOF@CNF)
under
an
effective
regulation
crystallization
kinetics
hydrothermal
synthesis.
Based
on
unique
dual-ligand
structure,
obtained
EuMOF
featured
tunable
antenna
effect
and
laid
good
foundation
fluorescence-sensing
materials.
Benefiting
from
superior
self-assembly
properties
CNFs
EuMOF@CNF,
flexible
films
were
constructed,
showing
excellent
mechanical
(72
MPa
stress
3.8%
strain)
luminescence
achieving
instant
(1
s)
sensitive
fluorescence
sarin
analogue
vapor
significantly
low
limit
(LOD,
2.8
ppb)
robust
selectivity
against
wide
range
common
interferents
(>14
types),
independent
acids.
We
believe
that
this
pioneering
design
effects
would
positively
advance
development
high-performance
MOF-based
fluorescent
materials
devices.
